CN216630777U - Glyphosate continuous acidolysis dealcoholization reaction device - Google Patents
Glyphosate continuous acidolysis dealcoholization reaction device Download PDFInfo
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- CN216630777U CN216630777U CN202123164600.6U CN202123164600U CN216630777U CN 216630777 U CN216630777 U CN 216630777U CN 202123164600 U CN202123164600 U CN 202123164600U CN 216630777 U CN216630777 U CN 216630777U
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Abstract
A glyphosate continuous acidolysis dealcoholization reaction device is characterized in that a glyphosate mixed acid liquid storage tank is connected with an acidolysis dealcoholization reactor, the acidolysis dealcoholization reactor is provided with a first reaction functional section, a second reaction functional section, a third reaction functional section and a fourth reaction functional section from top to bottom, the first reaction functional section is a filler section, and other adjacent reaction functional sections are separated by a sieve plate. The lower part of the second reaction functional section is connected with the circulating pump through a liquid phase pipeline and then connected to the middle part of the second reaction functional section. The lower part of the third reaction functional section is connected with a circulating pump through a liquid phase pipeline and then connected with a heater I, and the heater I is connected to the middle part of the third reaction functional section. The lower part of the fourth reaction functional section is connected with a second heater after being connected with a circulating pump through a liquid phase pipeline, one path of the circulating pump is connected to a discharge pipeline, and the other path of the circulating pump is connected to the middle part of the fourth reaction functional section through the second heater.
Description
Technical Field
The utility model relates to the technical field of glyphosate production, in particular to an acidolysis dealcoholization reactor in a continuous acidolysis dealcoholization process of glyphosate.
Background
Glyphosate is a high-efficiency, low-toxicity, broad-spectrum, biocidal and non-selective herbicide, has excellent biological characteristics, and is the herbicide variety with the largest global yield. At present, the domestic main stream production process of glyphosate has two routes: the alkyl ester process (glycine process) and the iminodiacetic acid process (IDA process). The foreign production process is mainly the iminodiacetic acid method of Monsanto in America. 70 percent of the capacity of glyphosate in China is produced by adopting an alkyl ester method which takes glycine and dimethyl phosphite as main raw materials, methanol is taken as a reaction solvent, and glycine, paraformaldehyde and dimethyl phosphite react in the presence of a catalyst triethylamine to obtain a synthetic liquid (glyphosate synthetic liquid). Mixing the synthetic solution with acid in a certain proportion to prepare mixed acid solution (also called mixed solution, acidolysis solution and hydrolysis solution in the industry), heating the mixed acid solution to the reaction end temperature by using steam, carrying out hydrolysis and acidolysis reaction along with the temperature rise to generate glyphosate and byproducts such as methylal and chloromethane, and steaming out the methylal, methanol, chloromethane and the like from a reactor. And (3) after the acidolysis reaction is finished, the residual liquid phase is glyphosate slurry, and glyphosate raw pesticide meeting the national standard is obtained through crystallization, separation, washing and drying.
The main components of the gas phase tail gas (namely the light component extracted by the fan) of the acidolysis reaction are water, methylal, methanol, hydrogen chloride and methyl chloride mixture, the tail gas goes to a gas phase tail gas recovery device for recovery treatment, and the recovery process is referred to as solvent recovery and methyl chloride recovery in the glyphosate industry: the distilled mixed gas is subjected to multi-stage condensation, condensate (dilute methanol) is removed from a solvent recovery device, and noncondensable gas is removed from a chloromethane recovery device for treatment; or independently condensing or absorbing the tail gas of the high-temperature section to recover the dilute hydrochloric acid; or neutralizing the distilled mixed gas in a neutralizing tower, recovering methanol and methylal from the neutralized gas, and treating the non-condensable gas in a chloromethane recovery device. The methanol is used as a solvent to be recycled to the glyphosate synthesis link, and the methylal and the chloromethane are sold as byproducts.
The production of glyphosate by a glycine method has a production history of more than 30 years, the procedures of solvent recovery, triethylamine recovery, chloromethane recovery and the like are industrially realized continuously, and the acidolysis dealcoholization process is still an intermittent stirred tank method due to the limitation of factors such as the characteristics of the acidolysis reaction of glyphosate and the like.
The batch hydrolysis process of glyphosate has the following problems: 1. low production efficiency, high comprehensive energy consumption and high labor intensity of workers. 2. The single set of device has small capacity, the reaction kettles with unit capacity have large quantity and multiple instrument control points, the front and the back lack of effective continuity, the operation has the problems of unstable product quality and the like caused by human factors, and the amplification and the improvement of intrinsic safety of the production device are also restricted. The continuous production of glyphosate can be controlled automatically, and the defects can be completely overcome. Therefore, the development of a continuous acid hydrolysis and dealcoholization device for glyphosate is one of the main research directions of glyphosate production enterprises.
Patent CN 111205319 a discloses a continuous synthesis method and system for glyphosate by using glycine method, wherein mixed acid obtained by acidifying synthetic liquid is subjected to primary hydrolysis reaction and secondary hydrolysis reaction, and slurry obtained after the secondary hydrolysis reaction is crystallized to obtain glyphosate. The primary hydrolysis reaction device comprises a primary hydrolysis reaction tower and a primary hydrolysis reaction kettle; the second-stage hydrolysis reaction device comprises a second-stage hydrolysis reaction kettle, and a gas outlet of the second-stage hydrolysis reaction device is connected with the hydrolysis tail gas condenser. And tail gas of the primary hydrolysis reaction device, condensate of the primary hydrolysis reaction device and tail gas are sent to a methanol recovery device for treatment. The hydrolysis reaction device of the method is divided into multiple stages, the device is complex, the flow is long, the acidolysis reaction time is long, and the yield is not high. And the method still relies on an enamel kettle as a reactor.
Disclosure of Invention
Aiming at the technical problem, the utility model provides a continuous acidolysis dealcoholization reaction device for glyphosate, and glyphosate mixed acid
The liquid storage tank is connected with the acidolysis dealcoholization reactor, the acidolysis dealcoholization reactor is provided with a first reaction functional section, a second reaction functional section, a third reaction functional section and a fourth reaction functional section from top to bottom, the first reaction functional section is a filler section, and other adjacent reaction functional sections are separated by a sieve plate.
The lower part of the second reaction functional section is connected with the circulating pump through a liquid phase pipeline and then connected to the middle part of the second reaction functional section.
The lower part of the third reaction functional section is connected with a circulating pump through a liquid phase pipeline and then connected with a heater I, and the heater I is connected to the middle part of the third reaction functional section.
And a slurry discharge port is formed in the bottom of the fourth reaction functional section and is connected with a circulating pump through a liquid phase pipeline, the circulating pump is divided into two paths through the liquid phase pipeline, one path of the circulating pump is connected to the crystallizer, and the other path of the circulating pump is connected to the middle of the fourth reaction functional section through a second heater.
The aperture of the sieve plate is 3-8mm, and the porosity is 10-15%.
When the aperture of the sieve plate is 8mm, the porosity is 10 percent; when the aperture of the sieve plate is 3-5mm, the porosity is 15%.
The top of the first reaction functional section is connected with other recovery devices.
In each functional section, the liquid phase from which the light components are removed overflows to the next section from top to bottom by gravity. The material steam from the second stage reaction functional section at the lower part of the tower and the acid mixing liquid entering from the top of the tower are in countercurrent contact in the first stage reaction functional section to carry out mass transfer, heat exchange, reaction and degassing. After the preheating and the primary dealcoholization of the first-stage reaction functional section, the liquid phase enters a second-stage reaction functional section, the temperature of the second-stage reaction functional section is maintained by heat energy brought by the non-condensable gas and saturated steam with higher temperature generated by the next-stage reaction functional section, the heat energy is balanced with the heat energy consumed by the vaporization of methanol and water in the second-stage reaction functional section, and volatile methylal and methanol components are vaporized and leave the reactor along with the rising non-condensable gas. The reaction liquid enters a third stage reaction functional section and a fourth stage reaction functional section for temperature rise reaction sequentially through overflow and underflow. The temperature of the third stage reaction functional section is maintained and controlled by the heat energy brought by the non-condensable gas and the saturated steam with higher temperature generated by the fourth stage reaction functional section and the heater on the external circulation pipeline; the temperature of the fourth stage reaction functional section is maintained and controlled by a heater on the external circulation pipeline.
In the case of a sieve plate for dividing the functional zone, a small part of the liquid flows automatically to the next stage through the sieve holes of the tower plate.
In each functional section, gas phases at all stages flow to the upper section from bottom to top by pressure difference, gas-liquid contact at a certain height is kept at the upper section for mass transfer and heat transfer, the gas-liquid mass transfer and heat transfer are enhanced by the action of steam stripping and aeration, and the gas stripping effect is realized, so that materials such as formaldehyde, methylal, methyl chloride and the like in the materials are quickly removed.
The light components (methanol, water, hydrogen chloride, methylal and methyl chloride generated in the acidolysis reaction process) in the reaction liquid form gas phase, and are respectively discharged from gas phase pipes at the upper parts of the first-stage reaction functional section, the second-stage reaction functional section, the third-stage reaction functional section and the fourth-stage reaction functional section. Wherein, the upper part of the first reaction functional section is the top of the tower. And gas phase tail gas generated by the second-stage reaction functional section is discharged from the tower top after mass transfer and heat transfer of the first-stage reaction functional section.
Solves the problem of 'back mixing' in the process of continuous batch stirred tank process modification and solves the problems of incomplete reaction (raw material generation) and the like of the original continuous technology. Therefore, the acidolysis hydrolysis chemical reaction process is complete and complete, the continuous operation is stable and reliable, the whole acidolysis reaction is completed in one reactor, and an enamel kettle is not needed for further auxiliary reaction; compared with the original intermittent stirring process, the method has the advantages of high yield, gradient utilization of heat and low steam energy consumption.
Drawings
Fig. 1 is an acidolysis dealcoholization reactor of example 1, wherein 1, a glyphosate mixed acid liquid storage tank, 2, an acidolysis dealcoholization reactor, 3, a first reaction functional section, 4, a second reaction functional section, 5, a third reaction functional section, 6, a fourth reaction functional section, 7, a first heater, 8, a second heater, 9, a gas recovery device, 10, a crystallizer, 11-1, 11-2, 11-3, 11-4, 11-5, and 11-6 are all circulation pumps, and 12, a sieve plate.
Fig. 2 is a structural view of the screen plate 12.
Detailed Description
Example 1
A glyphosate continuous acidolysis dealcoholization reaction device is characterized in that a glyphosate mixed acid liquid storage tank 1 is connected with an acidolysis dealcoholization reactor 2, the acidolysis dealcoholization reactor 2 is provided with a first reaction functional section 3, a second reaction functional section 4, a third reaction functional section 5 and a fourth reaction functional section 6 from top to bottom, the first reaction functional section 3 is a filler section, and other adjacent reaction functional sections are separated by a sieve plate 12.
The lower part of the second reaction functional section 4 is connected with a circulating pump through a liquid phase pipeline and then connected to the middle part of the second reaction functional section 4.
The lower part of the third reaction functional section 5 is connected with a first heater 7 after being connected with a circulating pump through a liquid phase pipeline, and the first heater 7 is connected to the middle part of the third reaction functional section 5.
The bottom of the fourth reaction functional section 6 is provided with a slurry discharge port, the slurry discharge port is connected with a circulating pump through a liquid phase pipeline, the circulating pump is divided into two paths through the liquid phase pipeline, one path is connected to the crystallizer, and the other path is connected to the middle part of the fourth reaction functional section 6 through a heater II 8.
The aperture of the sieve plate (12) is 8mm, and the porosity is 10%.
The top of the first reaction functional section 3 is connected with other recovery devices 9.
Example 2: by adopting the device in the embodiment 1, when the aperture of the sieve plate 12 is 8mm and the porosity is 10%, 8000kg of glyphosate mixed acid liquid enters the first reaction functional section of the acidolysis dealcoholization reactor at the speed of 2.5 m/h, and the liquid phase operation temperature in the first reaction functional section of the reactor is controlled at 40 ℃; liquid phase enters a second reaction functional section, a third reaction functional section and a fourth reaction functional section through the filler of the first reaction functional section, 80% of liquid phase discharge of the second reaction functional section is injected into the second reaction functional section, 80% of liquid phase discharge of the third reaction functional section and the fourth reaction functional section is injected into the third reaction functional section and the fourth reaction functional section after being heated by a first heater and a second heater, so that internal circulation of the reaction functional sections is realized, and the operating temperatures of the third reaction functional section and the fourth reaction functional section of the reactor are controlled to be 100 ℃ and 130 ℃ respectively until the reaction end point; the reaction liquid stays for 5 to 7 hours in the acidolysis dealcoholization reactor; the gas phase of the fourth reaction functional section enters the third reaction functional section, and the third reaction functional section enters the second reaction functional section. 3000kg of glyphosate slurry is finally obtained, the content of glyphosate is 23.0 percent, and the total yield is 86.2 percent.
Example 3: by adopting the device in the embodiment 1, when the aperture of the sieve plate 12 is 5mm and the porosity is 15%, 8000kg of glyphosate mixed acid liquid enters the first reaction functional section of the acidolysis dealcoholization reactor at the speed of 2.5 m/h, and the liquid phase operation temperature in the first reaction functional section of the reactor is controlled at 40 ℃; liquid phase enters a second reaction functional section, a third reaction functional section and a fourth reaction functional section through the filler of the first reaction functional section, 80% of liquid phase discharge of the second reaction functional section is injected into the second reaction functional section, 80% of liquid phase discharge of the third reaction functional section and the fourth reaction functional section is injected into the third reaction functional section and the fourth reaction functional section after being heated by a first heater and a second heater, so that internal circulation of the reaction functional sections is realized, and the operating temperatures of the third reaction functional section and the fourth reaction functional section of the reactor are controlled to be 100 ℃ and 130 ℃ respectively until the reaction end point; the gas phase of the fourth reaction functional section enters the third reaction functional section, and the third reaction functional section enters the second reaction functional section. 3080kg of glyphosate slurry is finally obtained, the content of glyphosate is 23.8 percent, and the total yield is 88.6 percent.
Claims (6)
1. The continuous acidolysis dealcoholization reaction device for glyphosate is characterized in that a glyphosate mixed acid liquid storage tank (1) is connected with an acidolysis dealcoholization reactor (2), the acidolysis dealcoholization reactor (2) is provided with a first reaction functional section (3), a second reaction functional section (4), a third reaction functional section (5) and a fourth reaction functional section (6) from top to bottom, the first reaction functional section (3) is a filler section, and other adjacent reaction functional sections are separated by a sieve plate (12).
2. The continuous acidolysis and dealcoholization reaction device for glyphosate according to claim 1, wherein the lower part of the second reaction functional section (4) is connected with a circulating pump through a liquid phase pipeline and then connected to the middle part of the second reaction functional section (4).
3. The continuous acidolysis and dealcoholization reaction device for glyphosate according to claim 1, wherein the lower part of the third reaction functional section (5) is connected with a first heater (7) after being connected with a circulating pump through a liquid phase pipeline, and the first heater (7) is connected to the middle part of the third reaction functional section (5).
4. The continuous acidolysis and dealcoholization reaction device for glyphosate according to claim 1, wherein a slurry discharge port is arranged at the bottom of the fourth reaction functional section (6), the slurry discharge port is connected with a circulating pump through a liquid phase pipeline, the circulating pump is divided into two paths through the liquid phase pipeline, one path is connected to the crystallizer, and the other path is connected to the middle part of the fourth reaction functional section (6) through a second heater (8).
5. The continuous acidolysis dealcoholization reaction unit for glyphosate according to claim 1, wherein the sieve plate (12) has a pore size of 3-8mm and a porosity of 10-15%.
6. The continuous acidolysis and dealcoholization reaction device for glyphosate according to claim 1, wherein the top of the first reaction functional section (3) is connected with other recovery devices (9).
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